An 18-year-old Guelph, Ont., man has been charged with assault and child porn charges after allegedly posting a "provocative" photo of his underage girlfriend as his BlackBerry profile photo.

Police said the high school student have been charged with four counts of assault, a criminal harassment for issues dating back to July 2010. He was also charged with voyeurism and distribution of child pornography.

Police said the man's BlackBerry profile photo is viewable by any BlackBerry contact the user has, and because the girl is 17, it is considered child porn.